>A society that adapts to become biologically immortal will find their own ways to adapt to dealing with zeitgeists and progress.

I don't think so. That is just wishful thinking. Our current society cannot even produce leaders who are remotely capable of solving current problems. And a group of immortals, once in power, cannot be trusted to not try to remain in office indefinitely using the powers they already have. They can subtly influence society and people with their power so that they can continue in power without actually rigging the elections..